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Genrish500 [490]
3 years ago
5

Please for the love of god anwser my question lay correctly I really need your help :( I will give 25 points :)! This is geometr

y
I need help asap it's rn​

Mathematics
1 answer:
tangare [24]3 years ago
5 0

Answer:

\displaystyle \rm  A_{ \text{c  - pentagon}} =41

\rm \displaystyle P _{ \rm c - pentagon} =  20+ 4 \sqrt{2}

Step-by-step explanation:

we have a square and a triangle

we want to figure out the area and the perimeter of the pentagon

to figure out the area of the pentagon we can use the given formula:

\displaystyle \rm  A_{ \text{c  - pentagon}} = A_{ \text{squre}} - A_{ \text{triangle}}

let's figure out A_{\rm square}:

since the given shape is a square Every angle of its 90° Thus the triangle is a right angle triangle

therefore the height is 4

\displaystyle A _{ \rm triangle} =  \frac{1}{2}  \times b \times h

substitute h and b

\displaystyle A _{ \rm triangle} =  \frac{1}{2}  \times 4 \times 4

reduce fraction:

\displaystyle A _{ \rm triangle} =   2 \times 4

simplify multiplication:

\displaystyle A _{ \rm triangle} =   8

likewise square

\displaystyle A _{ \rm squre} =  {s}^{2}

substitute s:

\displaystyle A _{ \rm squre} =  {7}^{2}

simplify square

\displaystyle A _{ \rm squre} =  49

hence,

\displaystyle \rm  A_{ \text{c - pentagon}} =49- 8

\displaystyle \rm  A_{ \text{c  - pentagon}} =41

to figure out perimeter

let's figure out hypotenuse first

\displaystyle h =  \sqrt{ {4}^{2}   +  {4}^{2} }

\displaystyle h =  \sqrt{ 16  +  16}

\displaystyle h = 4 \sqrt{2}

therefore,

\rm \displaystyle P _{ \rm c - pentagon} = 3 + 3 + 4 \sqrt{2}  + 7 + 7

\rm \displaystyle P _{ \rm c - pentagon} = 6 + 4 \sqrt{2}  + 14

\rm \displaystyle P _{ \rm c - pentagon} =  20+ 4 \sqrt{2}

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